if you have two sets of holes for the hear hindge pin than they are bk2 rears. they also fit the xxx, xxx4, xx4 and the X5. on the X5 you use the inside hole. the xxx-cr in EA3 compound would only have one set of holes that would fit the X5 just fine. Losi only makes the arms you have in graphite anymore. one size fits all.......
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